Locking and latching mechanism.



l. GREENFIELD.

LOCKING AND LATCHlNG MECHANISM.

APPLICATION FILED MAY 18. 1918;

1,275,246. Patented Aug. 13, 1918..

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llllll lllll llllllll 1 A TTURNEYS Patented Aug. 13, 1918..

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' changes and alterations in th of the invention is to connection withusually employed to inclose elevator shafts UNITED STATES "PATENT oFFoE.

ISIDORE GREENFIELD, or Bnooxmm, nEw YORK.

' LOOKING AND LATCHING MECHANISM. I v

' M Specification of Letters Patent.

To all whom it may concern:

Be it known that I, ISIDORE GREENFIELD, a citizen of the United States,residing at Brooklyn, in the county-of Kings and State of New York, aveinvented new and useful Improvements in Looking and Latching echanism,of which the following is a specification.

his invention relates to locking and latching mechanism, and a principalobject rovide a novel and efiicient locking and ing of my atchingmechanism which is designed particularly for use in sliding doors suchas are at the floor lan gs, such as are used for Warehouses, railwaycars and in other analogous capacities, but which in addition is alsocapable of being used in swinging doors if desired.

other object of the invention is 'the provision of a keyoperated lockingand latching mechanism of this character having connection with rat meaAu gla, 1918.

Application filed May 18, 1918. Serial No. 285,846. I

improved loc k, showing the working parts in elevation as they appearwhen in their relative unlocked positions. v

Fig. 2 is a similar view with the working parts-shown in their-relativelocked posi-' tions;

Fig. 3 is a cross sectional view, taken on v the line 3-3 of Fig. 1

- F1g.- 4 is a 'fragmental front elevational vlew, showing a mode ofattaching the lock to a sliding door,

Fig. 5 is a side 'elevational view, partly 1 broken away, illustratinghow the lock may be secured to the door, and illustrating also a commontype of key-operated mechanism for the operation of the lock.

ig. 6 is a front elevational view of the look as it appears from theoutside of a oor. v

Fig. 7 is a fragmental front elevational view of the lock and the keeperfor the latch bolt, this view showing in particular sliding boltsarranged to be actuated in opposite directions as means through which tolock the door from opposite sides, and also having a latch bolt workingacross the sliding bolts and arranged to be extended cordingly as thesaid sl'ding bolts are moved into locked or unlocke position. 1 Anotherobject of the invention is the d automatically locked or unlocked acprovision of a lock of this charactenwhich 1s key-operated from one sideonly so that when applied, for instance, to the doors guarding elevatorshafts, the lock can only be operated from the inside of the shaft so asto'safeguard against picking or tampering wit the lock from the outside.

With the foregoing andother objects in view, the invention resides inthe details of construction and in the arrangementand combination ofparts hereinafter described, defined in the claims, and shown incjompanying drawin s forming a part, of.

the acthis. specification; it eing understood that e precise em bodimentof the invention herein shownzmay be made, to which changes andalterations the inventor is entitled, provided the same are efi'ected inthe scope of the accompany-. ing claims.

In the accompanying drawlngs, Figure 1- is a longitudinal sectionthrough the cascompanying drawings,

Mounted upon t a modified form of latch bolt.

Fig. 8 is a cross sectional. view, taken in the direction of the line8-8 ofFig. 7.

ith more particularreference to the ac wherein like characters ofreference, indicate like parts,- the lock'casing comprises two sectionsor plates one lOythe rear sect1on, which is intended to lie liatagainsta door as 11 u on the outside thereof, and the other 12,.t e frontsection,- which isformed all'around with the sides 13, the edges of' thecasing which comes adjacent to the j amb 17, and'the other set 18projecting similarly from the opposite end thereof they extend throughopenings in the front casing 12 with thelr outer ends lying flush orfront surface thereof.

with the outer at the corners the side the rear section alined. guideposts; one set 16:

ese sets o f,guide posts for as shown. 'The lengthofthese guide postsare such that sliding movement are bolts 19 and 20, re-

spectively, with their opposite ends extending'through suitableopeningsprovided in the top and bottom side flanges 13. As shown in Figs. 1 and2, the confronting sides of these sliding bolts areprovided with teeth21 to mesh with a gear 22 fastupon a shaft 23 which extends through thecasing midway between said sliding bolts. One end of the shaft ,'sjournaled for rotation in a socket 24 provided upon the inner side ofthe front section 12, while the other end thereof extends throughanopening 25 provided in therear section 10.

Fast upon the shaft 23 in advance of the gear 22 is a tumbler or camshaped device '26, about which extend the parallel sides 27 and 28 andconnecting cross pieces therefor 29 and 30 of the body or shank portionof the latch bolt 31, which works through an 32 provided in the sideflange 13, and the forward end of which is made with a vertically hookedend 33 designed to engage over a keeper 34, secured to the jamb 17. Thelatch bolt thus formed extends lengthwise of the casing across thesliding bolts 19 and 20, is held against displacementby the front casingsection 12,

and is limited in its movements by the sets of guide posts 16 and 18. Itis thus maintained for free swinging movement and is unconnected withany part except by a) spiral push spring 35, mounted around a pin 36,one end of which slides through an opening provided in the crossconnection 30, and the opposite end of which is pivotally connected to alug 37, which projects from the side flange 13. The opposite ends of thepush spring 35 are conected. respectively with said cross connection andsaid lug, so 4 that the spring normally urges the latch a bolt intoextended position: Another spring 38, angular in form, projects from theupper edge of the'body part 27 so as to impinge against the adjacentguide post 16 in such manner as to wardly into horizontal position withthe hook 33 engaged over its keeper.

The whole arangement is such that the latch bolt is thus engaged withits keeper when, through the actuati n of the gear 22, the sliding bolts19 and 2 are extended in opposite directions to lock the door 11 at itsbottom and .top edges by means of the bars 39 and 40, which arepivotally connected respectively with said sliding bolts, the remoteends of said bars'being guided by staple devices as 41 so as to enterrecesses as 42 or suitable keepers provided in the door jamb When thegear 22 is turned in the oppositev direction to retract the slidingbolts and to withdraw the bars 41, the

tumbler 26 impinges against the underside of .the latch bolt member 27,lifting the latch bolt upwardly in an obvious manner, so as force thelatch bolt doWn-' to disengage the-hooked end 33 from its keeper, theend of the spring 38 in the latter instance, being accommodated by arecess 43 conveniently provided in the side flange.

As a means-of positively locking the latch bolt against movementrelatively with respect to the sliding bolts when the latter are inlocked position, I prefer to provide the sliding bolt 19 with anintegral lug 44 having a projecting pin 45 which enters the slot 46provided in the upper edge of the latch bolt. As the' sliding bolts 19and 20 are moved by the gear into unlocked position,

the pin 45 is withdrawn from its seat 1n an obvious manner to permit theraising of the latch bolt. Ttwill be observed in Fig. 1 that when thelatchbolt is raised by the tumbler 26, it still projects, in the presentembodiment of the invention, beyond the end of the side flange 13,although released from its keeper in such manner that the sliding door11 may be moved away from the In order that this mechanism may beemployed with types of keepers other. than that like 34 herein'shown,provision 1s made for withdrawing the latch bolt wholly within thelockcasing by securing to cross connection 30, a stem 47 which works ina diagonal slot 48 provided in the casing section 12. Connected withthis stem upon the outside of the casing is a thumb piece 49 which maybe employed in an obvious manner to manually-retract the latch boltwithin the casing against the tension of the push spring 35, the latchbolt in this case sliding upon the opposite To secure the latch-bolt inretracted position, it provide a thumb piece 50 exterior of the casinthe stem of which works ina vertical slot 51, and to which .behind theslot is secured -a collar 52 and in front of the slot a longitudinalplate 53 whereby the thumb piece is held inoperative position,

so that'the inner end of the stem may engage larger than the slot 48 soas to conceal the latter irrespective of the relative position of thethumb piece. Similarly, the outer elongated plate 53 is madeconsiderably larger than the slot 51 so as to conceal the latter.

As a means .-of operating and locking the shaft 23 I provide anysuitable cylinder lock ends of the tumbler 26.

having a rotatable barrel which may be locked and unlocked with itskeeper. Thus,- in Fig. 5, I show a barrelkeeper 56 which is set in asuitable opening provided on the inner side of the door'11, this keeperat its inner end being provided with lugs 57 upon opposite sides, whichareconnected by means of bolts and screws as 58 with the the proper key,by which the. are retracted and the barrel rotated in the sections,key-controlled means tween said sliding to overlie the upwardly to beused on a swinging door.

.by said sha rear casing section 10. The rotatable key barrel 59arranged in the keeper is provided witha reduced outer ,end 60 ofsquarefor mation which projects into a suitable opening providedlongitudinally in the said shaft 23. The barrel 59 is, of course,provided with the usualkey slot for the eeper pins usual way.

form of latch bolt 61, the end ofwhich is here shown bent outwardlyat'right-angles ecting extension 62of the keeper, thisbolt bemgotherwise constructed andoperated precisely like the latch bolt'3l, and

Having thus described my invention, what claim isz-v I 1.. A look fordoors includinga casing, bolts slidably arranged therein and extendingthrough the opposite sides of the casing, t econfrontiif vided with teeta rotatable shaft, a gear thereon' in ,mesh with the teeth spectivebolts, a latch bolt slidably extending across said sliding bolts, meanson said shaft to raise said latch bolt when said sliding bolts are movedinto unlocked position, and means for positively locking said latch boltwhen said sliding bolts aremoved into locked position.

2. A ock for doors including assembled casing sections, a pair ofparallel spaced apart bolts slidablyextend' sections, saidbolts beingprovided with teeth on their confronting faces, a ear in mesh with theteeth of each of said olts t'o actuate the same in opposite directions,'a latch bolt slidable across said sliding bolts and working through theend of the assembled said gear, a tumbler operated by said keycontrolledmeans for raising said'latch bolt when said sliding bolts are moved intounlocked position, and means for locking said latch bolt with one ofsaid sliding bolts when the latter are vmovedlinto lockedposition, Y

3.'A lock for doors inclu pair of parallel bolts slidab e through said'casmg m' spaced-apart relation, said bolts their confrontbeingprovidedwith teeth on mg sides, a keyperatedshaft bolts, the

midway bea gear fast on said s aft 1n mesh with ing bolts and adaptedcaslng to engage a keeper,

a tumbler carried t to raise said latch bolt as the a sliding bolts aremoved into unlocked position, spring means for automatically extendingsaid latch bolt into locked position as said sliding bolts are movedinto locked position, and means for reception of and outwardly pro--adapted g sidesof said bolts being prob of the relng through said foroperating when thebolts' sition, spring means for guiding said bolt intoengagement with its keeper as mg a casing, a

teeth of each of said bolts, a latch bolt slidable across said slid-' toextend beyond the positively locking said latch bolt with one of saidslidingnbolts when the latter is moved into locked po- 4. In a doorlock, assembled casing sections, bolts slidable therethrough in parallelspaced teeth on their confronting sides, a shaft operatively secured inthe casing transversely v I thereof midway between said sliding bolts,In Flgs. 7 and 8, I illustrate a modlfied tend beyond said casingsections to engage its k raise said latch bolt from its sliding boltsare drawn into. unlocked position, means for automatically causing saidlatch bolt to engage its keeper as said sliding bolts are moved intolocked position, means for positively locking said latch bolt with oneof the sliding bolts when all of said Its are forced into lockedposition, means for moving said latch bolt independently of said sliding.bolts when all the bolts are in unlocked position, and key-controlledmechanism for operating said shaft.

. 5. A look for doors including a casing, bolts slidable throughsaidcasing in spacedapart parallel relation and provided with teeth ontheir confronting sides, shaft rotatably-arranged in said casing midwaybetween said bolts at right-anglesthereto, va gear fast on said shaft inmesh with each of said bolts to actuate directions, a latch boltarranged in said casing to slide across said sliding bolts and adaptedto extend beyond the casing to engage a keeper, a tumbler on said shaftto' impinge and raise said latch boltfrom its eeper as said slidingbolts are moved into unlocked position, spring means engaged betweensaid latch mally urge said eeper, means carried by said shaft to latchbolt into extended position, said tumbler being arranged to operateagainst the tension of said sprin means are moved into unloc ed 0- andtilting the sliding bolts, are moved into locked po-a sition, and meansfor actuating said latch bolt independently of said sliding bolts whenthe latter are 'in unlocked osition.

6. In a lock for doors,'the com ination of two sliding bolts arranged.in spaced-apart parallel relation,said bolts having teeth in theirconfrontiilgfaces, an operating gear in mesh with each of said bolts, alatch bolt slidably arranged across said sliding bolt and adapted toengage a keeper, means for causing said latch bolt to engage its keeperwhen said sliding bolts are moved into locked position, and meanscarried by one of said sliding bolts toengage-said latch bolt holdapartrelation and provided with keeper as said the same in opposite bolt andsaidcasing to nor- V ing it positively against disengagement when saidsliding bolts are moved into locked position.

'27. In a door lock, the combination of a 5 slidingt olt provided withteeth on one side, a sha a gear mounted on said shaft in mesh with saidsliding bolt to actuate the latter, a latch bolt arranged across saidsliding bolt and adapted to engage a keeper,

1 means on said shaft to raise said latch bolt from its keeper as saidsliding bolt is moved into unlocked position, and means on said slidingbolt to engage said latch loolt Whereby to hold the same positivelylocked with its keeper when the sliding bolt is moved 15 into lockedposition.

In testimony whereof I have signed my name to this specification.

isinonii ennnnninnn.

